That is too early.

What else can you say about the buds? Do they appear moist or dry? Are the hairs still kind of normal looking or are they all shrivelly and tight up against the bud?

Are there dead, grey areas?

Hard, crispy buds that dry prematurely can mean a Zn deficiency.

I don't believe it's a good idea to mess around with micro nutes that late in flowering. But you can check on your pH to make sure that it isn't just a nutrient lockout.